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Normal range of values for contractility and relaxation parameters of inspiratory muscles in healthy children: An

Maria Lira1,2, Guilherme Fregonezi1,2, Ana A Marcelino1,2

  • 1PneumoCardioVascular Lab/Hospital Universitário Onofre Lopes (HUOL), Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil.

Pediatric Pulmonology
|April 17, 2020
PubMed

Insights

This study found that respiratory muscle contractility and relaxation parameters are similar in healthy children, unaffected by sex, age, or physical activity. These findings establish normal ranges for pediatric respiratory function assessment.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology
  • Exercise Science

Background:

  • Assessing inspiratory muscle function is crucial for pediatric respiratory health.
  • Establishing normal reference ranges for respiratory muscle parameters in children is essential for accurate diagnosis and management.
  • Previous research has not comprehensively evaluated the influence of sex, age, nutritional status, and physical activity on these parameters in healthy children.

Purpose of the Study:

  • To determine the normal range of values for inspiratory muscle contractility and relaxation parameters in healthy children.
  • To compare these parameters across different sexes, age groups, nutritional statuses, and levels of physical activity.
  • To establish normative data for pediatric respiratory muscle function.

Main Methods:

  • An exploratory study involving 110 healthy children aged 6-11 years.
  • Assessment of anthropometric, spirometry, and respiratory muscle strength data.
  • Calculation of Maximum Rate of Pressure Development (MRPD), Maximum Relaxation Rate (MRR), time constant of decay curve (τ), contraction time (CT), and half-relaxation time (½ RT) from nasal inspiratory pressure curves.

Main Results:

  • Normal ranges were established for MRPD (8.09%–10.86%/10 ms), MRR (8.09%–10.86%/10 ms), τ (36.41–49.88 ms), CT (200–276 ms), ½ RT (117.5–148 ms), and MRPD/MRR (0.71–1.04).
  • No significant differences were observed in these parameters when compared by sex, age, nutritional status, or physical activity level (P > .05).

Conclusions:

  • Inspiratory muscle contractility and relaxation parameters exhibit similar values in healthy children.
  • These respiratory muscle function parameters are not significantly influenced by age, sex, nutritional status, or physical activity level in the pediatric population.
  • The findings provide valuable normative data for the assessment of respiratory muscle function in children.
Abstract

Keywords:
epidemiologypulmonary function testingrespiratory and airway muscle

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